Editorial changes:

- added heading "Introduction"
- broke introduction paragraph into two following editorial suggestion
- changed Lambda, Gamma symbols to italics
- changed L and D symbols to roman fonts
- changed i.e. to that is
- changed "~" within to about
- updated reference 36 to published peer reviewed  article
- changed g and Lambda in Figure 4 to italics (to be consistent with Supplementary Figure 5 change suggestion)
- defined a_0 and tau_d accordingly

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Point-to-Point response to referee comments:

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Reviewer #1 comment:
1) My only (tiny) remaining comment is that I would put the clear statement of
the probe power P=0.003 P_sat in the main text instead of the SI. This may be
perfectly clear to the authors when they write "weak probe", but for a more
general audience this clarification would be nice.

Reply:

We move the probe power statement to the main text, since the first mention of "weak probe" in the Experimental setup part of Results section.

"The power of the probe field is well below the saturation power P_sat of
the corresponding transition, which is set to approximately 0.003P_sat."

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